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The first idea of Pangaea was thought up by Alfred Wegner (1880-1930). He was not only a geologist but also, an astronomer. While he was a respectable scientist in his day, his theory was not generally accepted by his fellows in his field.

Wegner’s theory was that there was once a super continent that had moved apart over time. The name Pangaea, meaning “all lands”, seemed rather fitting. However, according to Wegner, it had not been intact sine the Carboniferous period, 300 million years ago.

It was not until years later that fellow scientist Arthur Holms rejuvenated his theory by bringing up thermal convection inside the Earth. This helped explained how the continents could be forced to move.

Convergent boundaries can be the location of severe earthquakes and volcanoes.

They also can be the cause of the formation of mountains. This occurs when two continental plates meet and crinkle. (Such as when the Indo-Australian Plate and the Eurasian Plates met to form the Himalayan Mountains.)

Examples: The San Andreas Fault in California where the North American Plate and the Pacific Plates are passing each other. The pressure builds up and releases in natural disasters that are very common in that are.

As you can see, we have many boundaries in the United States. Our greatest danger here in Ohio would be earthquakes. From 1983-1985 there were 13 small earthquakes felt in the Buckeye State. Earthquakes also occur often along the San Andreas Fault in California, as do landslides and mudslides. Other common disasters caused by plate tectonics in the U.S. include